adjust Gradle scripts of test projects

Author: siordache

test-project-groovy/greeter.startscripts/build.gradle

@@ -1,3 +1,4 @@
+import org.gradle.util.GradleVersion
 import org.javamodularity.moduleplugin.tasks.ModularJavaExec
 import org.javamodularity.moduleplugin.tasks.ModularCreateStartScripts
 
@@ -16,7 +17,12 @@ modularity {
 }
 
 application {
-    mainClassName = 'greeter.startscripts/startscripts.MainDemo'
+    if(GradleVersion.current().compareTo(GradleVersion.version("6.4")) < 0) {
+        mainClassName = 'greeter.startscripts/startscripts.MainDemo'
+    } else {
+        mainClass = 'startscripts.MainDemo'
+        mainModule = 'greeter.startscripts'
+    }
     applicationName = 'demo'
     applicationDefaultJvmArgs = ['-Xmx128m']
 }

test-project-kotlin/greeter.startscripts/build.gradle.kts

@@ -21,7 +21,8 @@ modularity {
 }
 
 application {
-    mainClassName = "$moduleName/startscripts.MainDemoKt"
+    mainClass.set("startscripts.MainDemoKt")
+    mainModule.set(moduleName)
     applicationName = "demo"
     applicationDefaultJvmArgs = listOf("-Xmx128m")
 }

test-project/greeter.startscripts/build.gradle

@@ -1,3 +1,4 @@
+import org.gradle.util.GradleVersion
 import org.javamodularity.moduleplugin.tasks.ModularJavaExec
 import org.javamodularity.moduleplugin.tasks.ModularCreateStartScripts
 
@@ -16,7 +17,12 @@ modularity {
 }
 
 application {
-    mainClassName = 'greeter.startscripts/startscripts.MainDemo'
+    if(GradleVersion.current().compareTo(GradleVersion.version("6.4")) < 0) {
+        mainClassName = 'greeter.startscripts/startscripts.MainDemo'
+    } else {
+        mainClass = 'startscripts.MainDemo'
+        mainModule = 'greeter.startscripts'
+    }
     applicationName = 'demo'
     applicationDefaultJvmArgs = ['-Xmx128m']
 }